Wrench



- G. R. BARKER WRENCH Flled Aug y2 1920 Apr. 24, 1923.

Patented Apr. 24, 1923.

UNITED STATES PATENT OFFICE.

GEORGE R. BARKER, OF JULIET, ILLINOIS, ASSIGNOR TO WILLIAIVI E. PRATT, OF

CHICAGO, ILLINOIS. -f

WRENCH.

Application filed August 2, 1920. Serial No. 400,630.

T all whom lt may concern.'

Be it known that I, GEORGE R. BARKER, a citizen of the United States, residing at Joliet, in the county of Will and State of Illinois, have invented certain new and useful Improvements in Wrenches, of which the following is a specification.

My invention relates more particularly to wrenches of the type employed to remove the nuts of automobiles, carriages and the like and is described and shown in connection with a device of this character, but it will be understood that the specific disclosure is for the purpose of exemplification only and that the invention is adapted to wrenches for other purposes and may be embodied in other forms of wrenches, the specific embodiment being disclosed for the purpose of exemplification only and the scope of the invention being defined in the following claim.

The object of the invention is to produce in simple form a wrench which can be quickly adjusted within wide limits to take nuts of different sizes and after such relatively rough adjustment conveniently and easily further adjusted to tightly clamp and hold the nut.

In the accompanying drawing illustrating the preferred form of the invention Fig. 1 shows aside elevation thereof partly in longitudinal section to show the interior part; Fig. 2 a top plan partially broken away, and Fig. 3 a cross section on the line a-s of Fig. 1.

The body portion of the wrench comprises a handle 47 a clamp ory jaw 5 and an intermediate rectangular portion 6 which is trougheshaped as shown in Fig. 3 and formed throughout a portion of its length as at 7 with a rack occupying the bottom of the trough. Preferably the clamp or jaw portion is o-f slightly larger diameter than the rectangular trough-shaped portion 6 to form at 8 a shoulder which matches the adjacent end of a sliding jaw member to be now described.

The sliding jaw member comprises a jaw proper 9 matching the jaw 5 of the body member and a rectangular sleeve 10 which has a close sliding fit on the trough-shaped portion 6 of the body member and may be adjusted along the latter member as required. A pawl 11 havinga tooth orl edge 12 to engage the rack 7 is pivotally mounted within the sleeve of the sliding jaw and at the same time has a certain amount of movement longitudinally of said jaw for. a purpose which will appear. Said pawl is formed or provided with laterally projecting trunnions 13 at its forward end, kwhich trunnions are received in open-ended slots 14 formed in downwardly projecting lugs or ribs 15 which are integral with the top wall 16 of the sleeve. As clearly appears in Fig. 1, the ribs are recessed or under-cut at their forward ends to form slots 14 and the trunnion-s 13 are not only free to turn within the slots but have a limited movement longitudinally thereof. Intermediate the trunnions the pawl projects slightly beyond. them and is engaged by an eccentric head 17 connected by a short neck 18 with a handle 19, said neck extending through and being journaled in a bore 2O formed in the upper wall of the sleeve and in a boss 21 projecting slightly above the latter. The construction may be conveniently assembled by forming the neck integral with the eccentric disc or head 17 and squaring the upper end thereof for the reception of the handle 19 provided with a square hole 22 to receive the end of the neck. The end of the neck is upset or headed over at 23 so as to hold the handle in place. The lower face of the handle about the opening 22 is formed with a slight boss 24 from the periphery of which projects a stud 25 which limits the movement of the handle by engaging with similar studs or projections 26, 26 cast upon boss 21. The handle is so related to t-he eccentric disc 17 and to the stop or stud above mentioned that when in the forward extreme position the shortest radius of the eccentric is in register with the pawl 11 and the latter may assume its extreme forward position. lVhen the handle is thrown rearwardly` however, the longest radius of the eccentric disc is in engagement with the pawl and the latter is therefore forced to its rearmost position. The pawl is formed .with an upwardly extending tail 27 and when the handle occupies its rearmost position, at which time it extends substantially longitudinally of the wrench, it extends over and forms an abutment which prevents the paWl rising and leaving the rack, or in other Words it locks it in engagement With the rack.

An upwardly extending handle 28 forms a convenient means for rotating the Wrench after it has been clamped upon the nut to be operated.

The operation of the device will be apparent from the foregoing description. In applying the Wrench to a nut, the handle 19 is swung to the Jforward position to permit the pa-Wl to slide 'forwardly of the sleeve 10 and the Wrench is then applied to the nut to be removed or screwed down, the movable jaw being slid forward into approximate it and the pawl dropped into engagement with the rack. The eccentric 17 is then rotated by the handle 19 to move the paWl rearwardly with respect to the sleeve 10, or in other Words to press the latter forward into tight contact With the nut. When the handle 19 arrives over the tail of the paWl the latter is locked in position and the wrench may be then rot-.ated either by the handle 4C or by the handle 28.

I claim:

In a Wrench of the class described, a body member having a. jaw fixed thereon and a trough-shaped portion7 a rack in the bottom of the trough-shaped portion of the body member, an adjustable member comprising a jaw, and a sleeve surrounding the troughshaped portion of the body member and adjustable thereon.7 a pa-Wl, trunnions on the paWl, mea-ns on the adjustable memberreceiving the trunnions and affording movement theretov longitudinally of the adjustable member, an eccentric journaled in the adjustable member and engaging the pawl to move the latter longitudinally of the adjustable member, a handle on the eccentric outside the adjustable member.

GEORGE R. BARKER. 

